1
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
Given a unity feedback system with open loop transfer function, $$$G\left(s\right)=\frac K{s\left(s+1\right)\left(s+2\right)}$$$ The root locus plot of the system is of the form.
A
GATE ECE 1992 Control Systems - Root Locus Diagram Question 16 English Option 1
B
GATE ECE 1992 Control Systems - Root Locus Diagram Question 16 English Option 2
C
GATE ECE 1992 Control Systems - Root Locus Diagram Question 16 English Option 3
D
GATE ECE 1992 Control Systems - Root Locus Diagram Question 16 English Option 4
2
GATE ECE 1992
Subjective
+8
-0
Block diagram model of a position control system is shown in figure. GATE ECE 1992 Control Systems - Time Response Analysis Question 5 English
(a) In absence of derivative feedback (Kt=0) , determine damping ratio of the system for amplifier gain KA=5. Also find the steady state error to unit ramp input.

(b) Find suitable values of the parameters KA and Kt so that damping ratio of the system is increased to 0.7 without affecting the steady state error as obtained in part (a).
3
GATE ECE 1992
Subjective
+2
-0
Bode plot of a stable system is shown in fig. The transfer function of the system is GATE ECE 1992 Control Systems - Frequency Response Analysis Question 39 English
4
GATE ECE 1992
Subjective
+8
-0
A unity feedback system has open-loop transfer function $$G(s) = {1 \over {s\left( {2s + 1} \right)\left( {s + 1} \right)}}$$

Sketch Nyquist plot for the system and there from obtain the gain margin and the phase margin.

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